Radio dial construction



May 15, 1928.

A. J. NEEF' RADIO DIAL CONSTRUCTION '2 Sheets-Sheet 1 Filed Feb. 2, 1926 U lH INVENTOR I Aaoijv/v 11% BY} WITN SE5 1Z2 .19

ATTORNEYS May 15, 1928.

A. J. NEEF RADIO DIAL CONSTRUCTION Filed Feb. 2, 1926 2 Sheets-Sheet 2 RM m. m W m mb A M WITNESSES Patented May 15, 1928.

UNITED STATES 1,670,272 PATENT OFFICE.

ADOLPH J. NEEF, OF BROOKLYN, NEW YORK.

RADIO DIAL CONSTRUCTION.

Application filed February 2, 1926. Serial No. 85,559.

This invention relates to a new construction of radio dial, and cooperating apparatus.

An object of the invention is to provide a radio dial construction which will permit one dial to be used to indicate the movement and relative position of two or more adjustable elements in a radio set such as condensers or couplers.

A further object is to provide an apparatus which is simple in construction, can be readily applied to an ordinary panel board without any substantial modifications of the same from the usual practice.

A further object is to provide a device in which two or more condensers or similar devices can be operated independently of each other and their positions be noted on the one dial, thus saving space on the panel board.

The invention is illustrated in the drawings, of whichlgure 1 is a front elevation of a. panel board with the construction of the invention mounted thereon;

Figure 2 is a plan view;

Figure 3 is a section taken on the line 33 of Figure 2;

Figure 4 is a section taken on the line 4-4 of Figure 1.

The form of the invention shown in the drawings is a preferred form, although it is understood that modifications in the construction and arrangement of the parts may be adopted without departing from the spirit of the invention as set forth in the ap ended claims.

its general aspect the invention includes a dial having its entire periphery graduated in degrees and associated with two pointers, each of which is adapted to swing over half the periphery. Each of these pointers is connected to-the pannel board with a separate ear. These gears are associated throng intermediate gearing with two knobs and also with separate shafts on which are mounted condenser plates, or the movable portions and other radio devices such as couplers, variometers, etc.

By operating one lmob, one condenser can be adjusted and its corresponding pointer will be moved over the scale to indicate its position. By operating the other knob the other condenser or varlable element can be adjusted separately and its osition indicated by the other pointer on e same scale.

Therefore, we can use two or more adjustable elements and only require one dial on the panel board, thus saving considerable space.

Preferably the variable elements and gearing or operating means are mounted on a composition frame disposed on the back of the panel board and only the shafts of the knobs and the sleeves on which the pointers are mounted project therethrough to the front of the panel board 011 which the single dial is located.

In the preferred form of the invention shown in the drawings, I dispose a panel board on which is mounted, as shown in Figure 1, rheostat knobs 11 and 12 and a tunlng dial 133 having a double scale, each scale extending from 0 to 100. Over this scale two pointers 14 and 15 are adapted to move, each moving over its own half of the scale. Two operating knobs 16 and 17 are associated with the dial 13 and a switch knoll; 18 is also mounted in association therewit As shown in Figure 2, on the back of the panel board I mount a metal plate 19, to which the auxiliary plate 20 is connected and spaced therefrom. Between these two plates I mount suitable gears and their supporting shafts. Also on the back of the plate 19 I mount condenser elements 21 and 22, which may also be of course other tuning elements such as couplers, variometers, etc. The condensers are provided with shafts 23 and 24, to which the movable plates of each condenser are connected.

For instance, as shown in Figure 3, the shaft 23 is designated, and supports a gear wheel 25, and the shaft 24 is shown as supporting a gear wheel 26. The gear 25 Is operated through a pinion 27 mounted on shaft 28 connected with the knob 16, whereas the gear 26 is' operated by a pinion 29 mounted on a shaft 30 connected to the knob 17. The gear 25 meshes with a gear 31 mounted on a sleeve 32 supported in the panel board and the plate 20, to the front end of which the pointer 14 is connected.

In the operation of the device, therefore, by turning knob 16 we move shaft 28, pinion 27 turning gear 25 mounted on shaft 23, which will cause the movement of the plates of condenser 21; At the same time we operate gear 31 mounted on sleeve 32 which the pointer 14 is connected, this pointer swinging over one half of the (11911.

When we operate the knob 17 we actuate the shaft 30, the pinion 29, the gear 26 and the shaft 24, on one end of which the plates of condenser 22 are mounted and on the other end of which the pointer 15 is mounted.

In this manner, therefore, we can control two or more elements by means of the operation of an equal number of knobs and pointer, but these pointers are all associated with one dial. It is conceivable that we can use more than two pointers and divide up the scale of a dial into appropriate sections over which each pointer will be adapted to move. Of course it is not necessary to congne each pointer to a separate section of the ial.

What I claim is:

1. In combination a plurality of ad'ustable radio circuit elements such as con ensers, couplers, etc., a plurality of pointers gear mechanism inde endently and operatively connecting sai elements with said pointers, and a single dial having a double scale, each scale extending over one half of the dial over one half which each pointer swings;1

2. a radio set, a panel board, two condensers at the rear of the panel board and each having a shaft carrying the movable members thereof, a gear wheel on the shaft of each condenser, a pointer secured to one of the said shafts, a sleeve mounted on the shaft carrying the pointer, a pointer secured to the sleeve, a gear wheel carried by said sleeve and meshing with the gear wheel of the other condenser shaft, a dial on the front of the panel board and having a double scale over each portion of which a pointer moves, shafts extending through the panel board and provided with knobs, and gear wheels on the shafts and meshing with the gear wheels on the condenser shafts.

3. A radio dial construction which includes a plurality of adjustable elements in a radio circuit, a dial having a lurality of scales thereon, each scale exten ing over a predetermined part of the dial, a plurality of pointers associated with the said dial and each movable over its appropriate scale, means for operatively connecting each of said pointers with one of said adjustable elements, and means for independently operating said pointers and said elements.

ADOLPH J. NEEF. 

